#28528: Can't combine 2 SearchVector-s with different configs
-------------------------------------+-------------------------------------
Reporter: M1ha Shvn | Owner: (none)
Type: Bug | Status: new
Component: | Version: 1.10
contrib.postgres | Keywords: SearchQueries
Severity: Normal | PostgreSQL FullTextSearch
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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Hey!
I'm trying to make a fulltext search on 2 languages: russian and english.
I've created GIN index for 2 languages in PostgreSQL and select query
works fine using an index:
{{{
CREATE INDEX CONCURRENTLY messages_conversationpart_body ON
messages_conversationpart USING gin((to_tsvector('russian', body) ||
to_tsvector('english', body)));
SELECT id, body FROM messages_conversationpart WHERE
(to_tsvector('russian', body) || to_tsvector('english', body)) @@
(to_tsquery('russian', 'cats') || to_tsquery('english', 'cats')) LIMIT 20;
}}}
Then I've found
[https://docs.djangoproject.com/en/1.11/ref/contrib/postgres/search/ this]
article and desided to form this query using django. Here's the result:
{{{
from django.contrib.postgres.search import SearchVector, SearchQuery
from messages.models import ConversationPart
qs = ConversationPart.objects.\
annotate(search=SearchVector('body', config='russian') +
SearchVector('body', config='english')).\
filter(search=SearchQuery(search_phrase, config='russian') |
SearchQuery(search_phrase, config='english'))
qs = qs[:20]
}}}
But attempt to execute this query returns TypeError: SearchVector can only
be combined with other SearchVectors
The reason is
[https://docs.djangoproject.com/id/1.10/_modules/django/contrib/postgres/search/
here]:
{{{
class SearchVectorCombinable(object):
ADD = '||'
def _combine(self, other, connector, reversed, node=None):
if not isinstance(other, SearchVectorCombinable) or not
self.config == other.config:
raise TypeError('SearchVector can only be combined with other
SearchVectors')
if reversed:
return CombinedSearchVector(other, connector, self,
self.config)
return CombinedSearchVector(self, connector, other, self.config)
}}}
So, what is the reason for config equality control?
--
Ticket URL: <https://code.djangoproject.com/ticket/28528>
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